Half Life in 00:20:41

Apparently this was 4 years in the making and I thought it was really entertaining and amazing to watch. A bunch of guys got together to assemble the all-time fastest Half Life run and smashed the existing world record. There are more details about how they did it on the video page itself.

Maybe you know this but anyways for those who don't: In Half-Life there are 2 doors that trigger at -1 health, and as such if you get blocked by them, they heal you with 1 healtpoint everytime, quickly building up health to the thousands.